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液态工质在满足一定内径要求的毛细管内会形成稳定的液柱——气塞系统。本文提出利用蠕动泵驱动毛细管内气液相间隔的工质单向循环流动,形成一个具有脉动热管效应的新型两相传热系统。搭建了系统实验装置,以去离子水为工质,当毛细管内径为3 mm,管内工质流速恒定为7 m/min时,实验研究了不同充液率的两相传热系统在加热功率分别为60 W、80 W和100 W时的传热特性。结果表明:该传热系统的最佳充液率为20%,在加热功率为60、80、100 W时,充液率为20%的传热系统达到稳态时的热阻分别为0. 52、0. 38、0. 30℃/W,相比于传统的水冷传热系统其热阻分别降低了32. 5%、45. 7%、50%。 相似文献
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Considering two characteristics of compact heat dissipation room and high heat flux, a novel miniature capillary pumped loop (MCPL) for electronics cooling was proposed. MCPL consists of evaporator, condenser, vapor and liquid line dissipates heat by boiling and condensation of working fluids with no extra power consumption. Working fluid circulation is ensured by vapor pressure and capillary head. Saturated wick screens vapor and liquid, and ensures one-way flow of working fluid with no extra valve. In order to promote heat dissipation capacity of MCPL, the intensified boiling and condensation structures are embedded into evaporator and condenser respectively, which are useful to increasing boiling and condensation efficiency. Startup and run characteristics are tested by experiments in the condition of different power inputs and working fluids. MCPL is capable of dissipating 80 W of thermal energy and keeping the bottom substrate temperature of evaporator at 80 ℃. 相似文献
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单刃—圆锥面刀具是一种新型刀具,只有一条圆弧切削刃,副切削刃被异化为圆锥面。切削时,该刀具能将工件表层金属与基体分离但并不去除,被分离的表层金属在圆锥面的挤压作用下形成翅片。通过研究单刃—圆锥面刀具的切削过程,建立了刀具几何模型,并根据刀具参数建立了圆弧切削刃、主后刀面和副后刀面的数学模型。利用该数学模型,在数控工具磨床上加工出了单刃—圆锥面刀具。 相似文献
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